Chloroquine

Chloroquine is a medication used to prevent and to treat malaria in areas where malaria is known to be sensitive to its effects. Certain types of malaria, resistant strains, and complicated cases typically require different or additional medication. It is also occasionally used for amebiasis that is occurring outside of the intestines, rheumatoid arthritis, and lupus erythematosus.Wikipedia

The FDA-approved drug label for chloroquine (Aralen) states caution should be taken when administering treatment to G6PD deficient individuals due to the possibility of hemolytic anemia. Full details are available here.